How do I add a newline to a windows-forms TextBox?

Have you tried something like:

textbox.text = "text" & system.environment.newline & "some more text"

Try using Environment.NewLine:

Gets the newline string defined for this environment.

Something like this ought to work:

textBox.AppendText("your new text" & Environment.NewLine)

Have you set AcceptsReturn property to true?

Try something like

"Line 1" & Environment.NewLine & "Line 2"

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